On the measurement of vacuum level in cryogenic vessels
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For thermocouple vacuum gauges, it is necessary to adjust the current value when measuring the vacuum level in cryogenic vessels. The substances found in such vessels include liquid oxygen, liquefied natural gas, liquid carbon dioxide, etc. Is the current value that needs to be adjusted the same for all of them? What should that value be in each case?
What is being measured is the vacuum level of the adiabatic jacket; it should have nothing to do with the medium inside the container.
Yes, but there is definitely a difference in the temperature of the medium inside the container; therefore, the temperatures set for measurement using thermocouple-based vacuum gauges will certainly vary
Is it mentioned in GBT18443.2-2008 Test methods for low-temperature performance of vacuum insulated equipment – Part 2: Measurement of vacuum level?
No, it only mentioned the conditions during testing